Gradients of galactic cosmic rays and anomalous helium to more than 23 A.U. during the increase of solar modulation in 1978-80During the transition to solar maximum (1978-81) the radial gradient of high energy galactic cosmic rays increased slightly, while the gradients of lower energy cosmic rays and the anomalous helium decreased. It is concluded that (1) Pioneer-10 at about 23 AU was still deep in a modulation region extending to more than 50 AU for both the galactic cosmic rays and the anomalous helium component, and (2) the modulation is controlled by changes in the size/geometry of heliospheric magnetic fields and/or propagation parameters, changes associated with large solar-flare shocks in 1978 and later.
Document ID
19820046929
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Bastian, T. S. (Chicago Univ. Chicago, IL, United States)
Mckibben, R. B. (Chicago Univ. Chicago, IL, United States)
Pyle, K. R. (Chicago Univ. Chicago, IL, United States)
Simpson, J. A. (Chicago, University Chicago, IL, United States)